Bit-holder for bit-stocks



(No Model.)

H. SMILEY. BIT HOLDER FOR BIT STOOKS.

tented Jan. 1'7 1888.

8 IIIIE N. PFIERS. Phowum n nu. wmin wmpio UNITED STATES PATENT OEEicE.

HENRY SMILEY, OF BOSTON, MASSACHUSETTS.

BIT-HOLDER FOR BIT-STOCKS.

SPECIFICATION forming part of Letters Patent No. 376,557, dated January17, 1888.

Application filed March 19, 1837.

To all whom itmay concern:

Be it known that I, HENRY SMILEY, a resident; of Boston, in the countyof Suffolk and State of Massachusetts, have invented a new and usefulImprovement in Bit-Stocks, of which the following, taken in connectionwith the accompanying drawings, is a specification.

My invention relates to improvements in bit-holders for bit-stocks; andthe objects of my improvements are to provide serrated jaws to hold thebit securely when used and to adjust the jaws on any size of bit, sothat it may be held firmly against the ridges of the jaws when soadjusted. I attain these objects by means of the mechanism illustratedin the accompanying drawings, in Which Figure l is a side elevation of abit-stock with the loose barrel and loose jacket in part section,showing the tool-holdi ng shaftinserted in position and one jaw removed.Fig. 2 is a front elevation of the tool-holding shaft in part section,with jaws in place and a bit inserted with its shank on the inner ridgesof the jaws. Fig. 3 is a sectional View on lineX X in Fig. 1. Fig. 4is asectional view on line AA in Fig. 1. Fig. 5 is an elevatiouof the innerpart of the jaw. Fig. 6 is a detailed view of the jaws, with alongitudinal section through the center. I

Similar figures refer to similar parts throughout the several views.

The tool-holding shaft is adj usted with aloose barrel, 26, and loosejacket 25, as shown and described in my Letters Patent of the UnitedStates granted to me January 18, 1887, No. 356,214, to which referenceis hereby made. Figs. 3 and 4 of the drawings forming part of thespecification of said patent illustrate the loose barrel and jacket, andFig. 5 the adj ustment of the said shaft in the head of a bitstock. Thebit-stock is operated by the wellknown means of a crank-arm, 27, andpresser 28, as described in said Letters Patent hereinbefore referredto.

1 is the tool-holding shaft, of metal, and has the slotted openings 2 2on each side, which extend from the outer end of said shaft 1 to adistanceone-half an'inch below the outer end of the fixed loose jacket25, as shown in Fig. 1. 50 The slotted opening 2 on one side of theshaft has a lower portion, 3, made wider, as shown I'll Serial No.231,617. (No model.)

in Fig. 1, to receive the wider portion of the jaws 8 8, as hereinafterdescribed.

4 is a chamber in said shaft 1, in which is adjusted, as shown in Fig.2, the plunger 5.

The plunger 5 (shown in Figs. 1, 2) has in its head the recess 6. (Shownin Fig. 2.) Upon the shank of the plunger 5 is adjusted the spiralspring 7. (Shown in Figs. 1 and 2.)

8 8 are jaws having curved parts 9 9, as 6c shown in Fig. 2, having thetoes resting in the recess 6 of the head of the plunger 5. Said plunger5 as thus arranged, in conjunction with the pivots 13 13, hereinafterdescribed, adjusted in the slotted openings 10 10 of said'65 curvedparts 9 9, serves to keep the jaws 8 8 together, so that they may have aparallel motion when pressed backward or forward,'and also keeps thejaws 8 8 even at the ends and prevents them from sliding past eachother.

1 1 is an angular recess in each of the jaws88, which vary in width fromthe outer end of said jaws to the curved parts 9 9, as shown in Fig. 5,so that thejaws 8 8 may bind equally on any tapering shank of a bitdesired to be held. In 7 Fig. 6 a longitudinal section cut through thecenterof the jaws 8 8 is represented, showing the ridges 15 andthe'angular recesses 11 as they meet in the center of said jaws. Theseangular recesses 11 extend to the curved parts 9 9 of the jaws 8 8, asshown in said Fig. 6.

The jaw 8 at its outer portion,which receives the bit, is serrated withthe ridges 15, which are about-one-quarter of an inch apart. The

tool-holding shaft 1 is provided with the angular recesses 12, one oneach side of said shaft, as shown in Fig. 4, and extend from the outerend of the shaft 1 to the inner end of jaws 8 8, at opposite angles tosaid jaws, and the function of said recesses 12 is to hold and 0 centerthe shank of the bit when inserted, the other two angles of the shank ofthe bit being held in the angular recesses 11 of the jaws 8 8.

13 is a pivot which passes through the toolholding shaft 1 and theslotted openings 10 of 7 adjusted on its shank, through the opening 3into the chamber): of the tool-holding shaft 1. I then place the jawsSin the slotted openings 2 of the tool-holding shaft, pivoting them, asdescribed, by pivots 13. The toes on the curved parts 9 of said jaws Iadjust in the recess 6 of the plunger 5. Vhen the jaws are adjusted asdescribed, pivots 13 are at the end of the slotted openings 10, as shownin Fig. 1. The slotted openings 10 10 in the inner portion of the jaws 88 are to allow the jaws to move backward or forward. The pivots 13 13,passing through said openings, keep the jaws in place, and at the sametime guide said jaws in a parallel plane to each other. The curvedportions 9 9, with the toes, when forced outward by the spring 7 underthe head of the plunger 5the head of the plunger 5 acting on the toes ofthe curved portions 9 9 and the pivots 13 13 as fulerums-cause the jawsS S to be thrown outward and open and then ready to receive any bit thatmay be placed in said jaws. Then a bit, 14, as shown in Fig. 2, may beinserted between the jaws, and by turning the loose jacket 25, describedin my Letters Patent No. 356,214, the loose barrel 26, described in thesame patent and operating as therein described, closes the jaws upon thebit 14, and the ridges of the jaws catch upon the stock of the bit andforce the stock back in the tool-holding shaft, the angles of the stockadjusting themselves in the angular recesses of the said shaft and saidjaws, the ridges holding the stock firmlyin place, so that it cannot bedrawn out. The plunger 5 being pressed back contracts the spring 7 inthe chamber 4 of the tool-holding shaft. The function of the plunger isto keep the spring in place and to regulate the jaws, so that the motionback and forward may be even or parallel. The ridges of thejaws adjustthemselves upon the various sizes of the stock of the bits which may beinserted in the tool-holding shaft. The bit is illustrated in Fig. 2 bya small stock, on which is adjusted the inner ridge of thejaws; but on alonger stock would be adjusted one of the other ridges, according to itslength. By turning the loose jacket, which throws the loose barreloutward, as described in my Letters Patent No. 356,214, the springexpands, and the head of the plunger, acting on the toes of the jaws asa leverage, throws the jaws open and forward, and it is obvious that thebit is then released.

IVhen a bit is adjusted as above described, it cannot become loose whileboring, as frequently happens in the use of ordinary bitstocks.

In my above description I have shown the ridges in thejaws arranged withthe apex of theirangles toward the outer end of thejaws; but it isobvious that said ridges may be arranged with the said apex toward theinner end of the jaws and accomplish a like purpose; but preferably Iuse the ridges as described. A

It is obvious that thejaws above described I must be used with a loosebarrel; but any loose barrel, however operated, may be used, and notnecessarily the loose barrel described in my Letters Patent No. 356,214.

Having described my invention and the operation thereof, what I desireto secure by Letters Patent and to claim is- 1. The jaws 8 8, providedwith curved parts 9, in which are slots 10, and having inside angularrecesses 11, extending from said parts 9 to the end of said jaws, whichangular recesses are serrated with the ridges 15 near the outer end ofsaid jaws, in combination with the tool-holding shaft 1, provided withslotted openings 2 2, in which said jaws 8 8 are pivoted by pivots 1313, all arranged substantially as described, and for the purpose setforth.

2. In a bit-stock, the tool-holding shaft 1, provided with angularrecesses 12 12 and interior chamber, 4, and having slotted openings 2,extending through said shaft, in combination with the jaws S S, adjustedin said openings 2 and pivoted therein by pivots 13, which pass throughthe slotted openings 10 of saidjaws, the said jaws being provided withangular recesses 11, serrated with the ridges 15, as described, havingcurved parts 9, the toes of which are adjusted in the chamber 4 of saidshaft 1, all arranged as described, and for the purpose set forth.

3. In combination, the tool-holding shaft 1, having slotted openings 2and 3 and chamber 4, the serrated jaws, provided with slotted openings,adjusted in the slotted openings of said shaft by pivots 13, passingthrough said shaft and said openings, the plunger 5, having the spring 7upon its shank,resting against the head, and arranged in the chamber 4of said shaft, as described, and provided with a recess, 6, in which areadjusted the toes of said serrated jaws, all substantially as'described, and for the purpose set forth.

4. The tool-holding shaft 1, provided with slotted openings and chamberand angular recesses, and having serrated angularly-recessed jawspivoted in said openings by pivots 13, and the plunger 5, with thespring 7 upon it, adjusted in the chamber 4 of the said shaft,with itshead recessed to be adjusted on the toes of said serrated jaws, incombination with a bit the stock of which is adjusted in the angularrecess of said shaft andjaws and against the ridges of said jaws, allarranged as described, and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 16th day of March, A. D.1887.

HENRY SMILEY.

XVitnesses:

FREDERICK DUNHAM, H. DUNHAM.

